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Influence Factors for Impact Actions and Transient Trajectories of Fan Blades after Fan Blade Out in Typical 2-Shaft High Bypass Ratio Turbofan Engine

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  • 1. Shenyang Engine Research Institute, Aero Engine Corporation of China, Shenyang 110015, China
    2. Corporation Headquarter, Aero Engine Corporation of China, Beijing 100097, China

网络出版日期: 2023-11-30

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

Influence Factors for Impact Actions and Transient Trajectories of Fan Blades after Fan Blade Out in Typical 2-Shaft High Bypass Ratio Turbofan Engine

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  • 1. Shenyang Engine Research Institute, Aero Engine Corporation of China, Shenyang 110015, China
    2. Corporation Headquarter, Aero Engine Corporation of China, Beijing 100097, China

Online published: 2023-11-30

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

摘要

为了深入研究对于风扇叶片飞失事件具有重要影响的设计参数,推导了简化的几何学和动力学的解析计算方法,选择典型的双转子大涵道比涡扇发动机建立了仿真分析模型。基于解析方法和真实的叶片飞失事故中得到的工程经验,识别出了三个具有决定性的风扇叶片飞失冲击过程。通过对于三个瞬态过程轨迹的解析计算分析,提出了声衬厚度、叶片数和风扇叶片飞失结构保险门限值三个关键设计参数。采用建立的双转子大涵道比涡扇发动机的仿真模型,完成了由三个关键设计参数不同取值组合形成的36个系列化风扇叶片飞失仿真。结果表明解析计算分析和三维仿真符合较好。仿真分析的特征现象可以得到解析法的合理解释。通过上述分析可以得到以下五点结论:1)如果风扇声衬较薄,简化的解析方法和仿真分析方法在预测飞失的第一枚叶片和机匣的第一次撞击点的时间和角向位置方面的结果区别不大。2)选取一个合适的声衬厚度可以降低在飞失叶片和机匣的第一次撞击时的冲击应力。3)不同的声衬厚度带来了第一枚叶片撞击第二枚叶片存在叶尖撞击和叶根撞击两种不同的撞击模式。4)第一枚叶片撞击第二枚叶片的不同撞击条件导致第一枚叶片向后飞行的速度分量存在巨大差别,从而导致不同条件下第一枚叶片的轨迹范围很广。5)在本研究中,较厚的声衬经常可以选择到合适的结构保险门槛值,能够实现较为满意的外传应力。对于后续的研究,提出了两个需要进一步细节,一个是复合材料风扇叶片和复合材料蜂窝的冲击动力学行为的研究,一个是更加款范围的结构保险门槛值对于较薄的声衬设计的影响研究。

本文引用格式

XU Xue, LI Hongxin, FENG Guoquan . Influence Factors for Impact Actions and Transient Trajectories of Fan Blades after Fan Blade Out in Typical 2-Shaft High Bypass Ratio Turbofan Engine[J]. 热科学学报, 2022 , 31(1) : 96 -110 . DOI: 10.1007/s11630-022-1556-2

Abstract

To enhance the understanding of design characters, which have prominent influences during the fan blade out event, a simplified geometrical and dynamic analysis method was derived, and a typical 2-shaft high bypass ratio turbofan engine was selected and modeled. Based on analytical deriving and engineering experience learned from the real engine failure case, three determinative impact actions were recognized from the fan blade out process. The transient trajectories of these impact actions were researched in analytical method, and then thickness of acoustic lining, quantity of fan blades and threshold load of structural fuse were analyzed as key design characters. 36 serialized fan blade out transient dynamic simulations were conducted by using the 2-shaft high bypass ratio turbofan engine model within different combinations of the three key design factors. The results from geometrical and dynamic analysis matched mainly well with the results from simulations. Characteristic phenomenon in simulation can be explained theoretically. Five conclusions can be summarized from these results. (1) If thickness fan acoustic lining was thinner, the deviation between simplified analytical calculation and simulation were not outstanding to predict Blade-Casing the first impact time and angular position. (2) An appropriate thickness of acoustic lining could make a lower impact stress of fan casing at the first impact. (3) Different thickness of acoustic linings leaded to two impact modes for blade 2, which were tip impact and root impact. (4) Different impact conditions between blade 1 and blade 2 caused remarkable speed components distinction of blade 1, and leaded to a wide range of transient trajectory of blade 1 during FBO event. (5) Thicker acoustic lining in this research can usually find the porper threshold loads setting, which can give a satisfactory outbound vibration. Two details were raised for further research, which were impact behavior of composite material fan blade and honeycomb and influences of wider FBO threshold load ranges in design cases with thinner acoustic lining.

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